- tomography.rs: use checked_mul for nx*ny*nz to prevent integer overflow
on adversarial grid configurations
- phase_align.rs: add defensive bounds check in mean_phase_on_indices to
prevent panic on out-of-range subcarrier indices
- multistatic.rs: stabilize softmax in attention_weighted_fusion with
max-subtraction to prevent exp() overflow on extreme similarity values
Co-Authored-By: claude-flow <ruv@ruv.net>